VDW

VDW-Q-Z/500×24

Nominal sizes

□500×24

Circular diffuser faces with circular plenum box

Square diffuser face with square plenum box

Circular face style with circular plenum box and top entry spigot

Circular diffuser face with white air control blades

Air terminal device up to size 825

VDW

WITH LOW SOUND POWER LEVEL FOR COMFORT ZONES, WITH INDIVIDUALLY MANUALLY ADJUSTABLE AIR CONTROL BLADES

Circular and square swirl diffusers for high air change rates

Nominal sizes 300, 400, 500, 600, 625, 825
Volume flow range 7 – 470 l/s or 25 – 1692 m³/h
Diffuser face made of galvanised sheet steel, powder-coated
For constant and variable volume flows
For all ceiling systems, and with an extended border also suitable for freely suspended installation
Small diffuser faces for 600 and 625 ceiling grids
High induction results in a rapid reduction of the temperature difference and air velocity
Ideal for comfort zones

Optional equipment and accessories

Exposed diffuser face available in RAL CLASSIC colours, air control blades in black or white
Horizontal and vertical spigots
Square plenum box with cord-operated damper blade and pressure tap

Initialize order code

General information

Application

Swirl diffusers for supply air and extract air in comfort zones
A design feature for building owners and architects with high demands on architecture and design
Horizontal swirling supply air discharge for mixing ventilation
Efficient swirling airflow with high induction for rapid reduction of temperature differences and air velocity (supply air)
For constant and variable volume flows
For supply air to room air temperature differences of -12 – +10 K
For rooms with heights up to 4 m (underside of suspended ceiling)
For all types of ceiling systems
Smaller swirl diffusers suitable for 600 or 625 ceiling grids
With an extended border also suitable for freely suspended installation (supply air variant)

Special characteristics

High induction results in a rapid reduction of the supply air to room air temperature difference and airflow velocity
For all ceiling systems, and with an extended border also suitable for freely suspended installation
Smaller swirl diffusers suitable for 600 or 625 ceiling grids
Spigot horizontal and vertical
Very high room air change rates possible thanks to row arrangement with a minimum centre-to-centre spacing of 0.9 m

Nominal sizes

300 x 8, 400 x 16, 500 x 24, 600 x 24, 600 x 48, 625 x 24, 625 x 54, 825 x 72

Variants

VDW-Q: Square diffuser face
VDW-R: Circular diffuser face
VDW-*-Z: Supply air
VDW-*-A: Extract air

Spigot

H: horizontal spigot
V: vertical spigot

Accessories

Lip seal

Optionally available

Note:

For circular plenum box with horizontal spigot: Lip seal only available in combination with damper blade

Attachments

M: Damper element for volume flow rate balancing
MN: Pressure tap and cord-operated damper unit for volume flow rate balancing with the diffuser face in place (only possible with square plenum box)

Construction features

Spigot suitable for circular air ducts according to DIN EN 1506 or DIN EN 13180
Spigots are always fitted with a groove for a lip seal
Retrofitting of the lip seal is possible at a later stage
Optional: Lip seal and damper blade are factory-fitted
Simple installation of the diffuser face using a central fixing screw with cap

Square plenum box

Spigot made of galvanised sheet steel
Equalising element to ensure a uniform airflow through the diffuser face (supply air variant)
Circular plenum box
With vertical spigot: Spigot made of galvanised sheet steel
With horizontal spigot: Spigot made of black ABS plastic
Equalising element to ensure a uniform airflow through the diffuser face (supply air variant)

Materials and surfaces

Diffuser face

Made of galvanised sheet steel
Coated, RAL 9010, pure white (no entry)
P1: powder-coated, RAL CLASSIC colour

Damper blade

Made of ABS plastic

Circular plenum box

Made of galvanised sheet steel
With vertical spigot
Spigot made of galvanised sheet steel
For supply air, with galvanised perforated plate for air distribution
With horizontal spigot
Spigot made of black ABS plastic, flame-retardant in accordance with UL94, V0
Equipped with a polyester equalising element for supply air
Crossbar made of galvanised sheet steel for mounting the diffuser face

Square plenum box

Made of galvanised sheet steel
With horizontal spigot
Spigot made of galvanised sheet steel
For supply air, with galvanised perforated plate for air distribution
Crossbar made of galvanised sheet steel for mounting the diffuser face

Lip seal

Made of Evoprene

Air control blades

Supply air:
Similar to RAL 9005, jet black
Made of plastic, UL 94, V- 0, flame-retardant
Q21: Air control blades supply air similar to RAL 9010, pure white

Extract air:

No air control blades
Q11: Air control blades for extract air similar to RAL 9005, jet black
Q21: Air control blades for extract air similar to RAL 9010, pure white

Standards and guidelines

Spigot, suitable for air ducts according to DIN EN 1506 or DIN EN 13180
Sound power level of the air-regenerated noise measured according to DIN EN ISO 5135

Maintenance

Low maintenance as construction and materials are not subject to wear
Inspection and cleaning to VDI 6022

Disclosure of Chemicals

RoHS EU Directive 2011/65/EU (RoHS)

This product or single variants comply with EU Directive 2011/65/EU (RoHS) on the restriction of the use of certain hazardous substances in electrical and electronic equipment. For more information, please refer to our Environmental Product Declarations.

REACH 1907/2006 (EC Regulation REACH)

This product or single variants comply with the provisions of EC Regulation No. 1907/2006, also known as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals). For more nformation, please refer to our Environmental Product Declarations.

Technical information

Schematic illustration of VDW-Q with square plenum box

① Diffuser face

② Central fixing screw

③ Adjustable air control blade

④ Plenum box

⑤ Cross bar

⑥ Suspension hole

⑦ Spigot

Optional

⑧ Lip seal

⑨ Damper blade for volume flow rate balancing

⑩ Pressure tap

⑪ Green cord for closing the damper blade

⑫ White cord for opening the damper blade

⑬ Measuring tube

⑭ Text label indicating plenum box variant

Ceiling swirl diffusers in air conditioning systems create a swirl to supply air to rooms. The resulting airflow induces high levels of room air, thereby rapidly reducing the airflow velocity and the temperature difference between supply air and room air. Ceiling swirl diffusers allow for large volume flow rates. The result is a mixed flow ventilation in comfort zones, with good overall room ventilation, creating only very little turbulence in the occupied zone.

Type VDW ceiling swirl diffusers have adjustable air control blades. The airflow direction can be adjusted to meet various local requirements. Horizontal air distribution consists of one-way, two-way or omni-directional flow. Vertical air discharge is possible but only for heating. The supply air to room air temperature difference may range from –12 to +10 K.

A damper blade (optional) simplifies volume flow rate balancing for commissioning. Pressure tap and cord-operated damper blade (optional) allow for volume flow rate balancing with the diffuser face in place.

To give rooms an aesthetic, uniform look, Type VDW diffusers may also be used for extract air. Air control blades are not required for extract air applications.

Nominal sizes	300, 400, 500, 600, 625, 825 mm
Dimensions ceiling panel	598 x 598 or 623 x 623
Minimum volume flow rate, with Δtz = -6 K	7 – 99 l/s or 25 – 357 m³/h
maximum volume flow, at LWA ≅ 50 dB(A)	80 – 470 l/s or 288 – 1692 m³/h
Supply air to room air temperature difference	-12 – +10 K

VDW

–

500 × 24

Q21

P1 - RAL 9016

1 Type
VDW Swirl diffuser

2 Construction style
R Circular
Q Square

3 System
Z Supply air
A extract air

4 Connection
H horizontal
V Vertical (the plenum box is always circular)

5 Damper blade for volume flow rate balancing
No entry required: Without damper unit
M With
MN With cords and pressure tap (only with square plenum box)

6 Accessories
No entry required: Without accessories
L with lip seal

7 Nominal size [mm]
300 × 8
400 × 16
500 × 24
600 × 24
600 × 48
625 × 24

Omly with construction style Q
625 × 54
825 × 72

8 Colour of air control blades
No entry required: supply air – black air control blades, extract air – no air control blades
Q11 Extract air – black air control blades
Q21 Supply air – white air control blades; extract air – white air control blades

9 Exposed surface
No entry: powder-coated RAL 9010, pure white
P1 Powder-coated, specify RAL CLASSIC colour

Gloss level
RAL 9010 GU50
RAL 9006 GU30
All other RAL colours GU70

Note: Circular plenum boxes with horizontal spigot are only available without damper unit and lip seal or with damper unit and lip seal. Features 2 and 4 define the plenum box geometry.

Downloads

product information

Product data sheet Type VDW

VDW_PD_2026_06_15_DE_en Product data sheet 1,5 MB pdf

certificates

Declaration of hygiene conformity Type VDW

VDW_HC_2025_11_en Declaration of hygiene conformity 1,1 MB pdf
Environmental Product Declaration VDW

VDW_EPD_2024_03_DE_en Environmental Product Declarations 450 KB pdf
Non-CE Manufacturer's statement VDW

VDW_MS_CE_2026_01_DE_en Manufacturer's statement 1000 KB pdf

miscellaneous

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WITH LOW SOUND POWER LEVEL FOR COMFORT ZONES, WITH INDIVIDUALLY MANUALLY ADJUSTABLE AIR CONTROL BLADES

General information

Technical information

Downloads

product information

Product data sheet Type VDW

certificates

Declaration of hygiene conformity Type VDW

Environmental Product Declaration VDW

Non-CE Manufacturer's statement VDW

miscellaneous

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